Frequencies for first 10,000 rows of pct012e157 variable in sf12000860us20 dataset :

   50 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,792       97.92       97.92
          1 |        190        1.90       99.82
          2 |         15        0.15       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017